The Wilson Rockwell Hardness Test Block Calibration Set is a precision instrument designed for measuring hardness in metals. Made by the reputable brand Wilson, this set includes test blocks that are calibrated to ensure accurate readings when used with a hardness tester. Ideal for metalworking inspection and measurement, this set is essential for achieving consistent and reliable results in CNC machining, metalworking, and manufacturing processes. It provides a useful tool for maintaining quality control in industrial settings.  Excellent condition and very clean.